Re: Problem with my Canon! ;(
BTW, here are some basic info for you:
Smaller f number = larger aperture = brighter picture (and vice versa)
The zoom lens on most digicams will have smaller max aperture as you zoom towards the tele end. That's why I suggested zooming out (toward wide end) as much as you find acceptable. In your case, the max range is f/2.6 for wide end to f/5.5 for tele end -- that's a pretty big diff in max aperture of ~2 stops of light capture.
Smaller/faster shutter speed = dimmer picture (and vice versa)
FYI, doubling of shutter speed = loss of 1 stop of light capture (and vice versa).
Higher ISO = brighter (but also grainier) picture (and vice versa)
ISO is inversely proportional to shutter speed in how it impacts the exposure (or light capture ability or brightness of the picture). So doubling of ISO = gain of 1 stop of light capture (and vice versa).
Slower shutter speed will also mean more chances of either camera shake blur or subject motion blur. Generally, the rule of thumb for most folks under normal shooting situations is that 1 / focal length (at 35mm equiv) would be the minimum shutter speed for handholding the camera w/out camera shake blur. YMMV on this, and bracing the camera against something steady can help. Subject motion blur can easily occur if you shoot at slower than 1/60s unless the subject is staying very still. And if the subject is actively moving, you will often need to go upto 1/250s or faster to avoid motion blur, eg. for sports action.
One thing. Flash can typically act as an extremely fast shutter to "freeze" the subject (possibly independently of the subject's environment). However, flash has a limited range depending on its power output (along w/ aperture and ISO settings, but usually not depending on shutter speed). The built-in flash on most any camera will have very little range, eg. typically no more than ~10ft unless you bump up the ISO big time. That's why you see serious photogs often using a big external flash (or much more) when flash is needed -- well, that and because on-camera flash tends to yield red eye, nasty shadows, and generally unnatural look. Because using flash means introducing a 2nd light source other than what's already in the scene (ie. the ambient/available light), you might often get interesting or possibly unwanted effects from the mixed light exposure, eg. flash lit subject w/ possibly motion (or camera movement) blurred backgrounds that have different color cast.
Finally, the EV number in your camera's exposure compensation is equivalent to the "stops" of light capture I mentioned above. For instance, 1/3 EV = 1/3 stop, 1 EV = 1 stop, etc. You generally would use exposure comp to adjust the exposure settings determined by your camera's meter as you see the need since the camera's meter is not intelligent enough to know exactly what's needed for every shot. The meter is typically just using a simple algorithm that assumes some sort of average reading of the scene and can easily be tricked by more than usual amount of bright or dark areas or areas of one particular color, etc. An exception would be if you use spot metering, but these inexpensive little digicams do not have true spot metering.
When you shoot in M (manual) mode, you bypass the camera's meter to select your own aperture, shutter speed and ISO. When you use Av mode, you set the aperture (and ISO) and allow the camera to choose the shutter speed it thinks will yield an average exposure -- and adjusting exposure comp would result in adjusting the shutter speed. When you use Tv mode, you set the shutter speed (and ISO) and allow the camera to choose the aperture -- and adjusting exposure comp would result in adjusting the aperture setting. When you use P (program) or Auto mode, you let the camera choose both aperture and shutter speed though P mode still lets you adjust exposure comp and set ISO. Regardless of the method and settings you use, you should note that there's no guarantee the camera can actually capture the scene adequately since the camera (like *all* cameras) has its limitations. Sometimes, you just can't capture what you want no matter what you do (even if you spend $$$ to get the very best gear).
Well, hope this little crash course on some basics will help you...
_Man_